QUESTION

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30. Derive the equations \[ \begin{array}{ll} m_{1} x_{1}^{\prime \prime}=-\left(k_{1}+k_{2}\right) x_{1}+k_{2} x_{2}, \\ m_{2} x_{2}^{\prime \prime}= & k_{2} x_{1}-\left(k_{2}+k_{3}\right) x_{2} \end{array} \]
for the displacements (from equilibrium) of the two masses shown in Fig. 4.1.11. FIGURE 4.1.11. The system of Problem 30.

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